Sorry if this is a simple question, but I‘m quite new to Arduino. What I‘m looking for is a way to connect 100+ strain gauges to one Arduino board.
Now, those each need a separate ADC (HX711) to convert the input from snalog to digital (best would be if only 1 was needed)(Also, I use 3 resistors to make it a quarter-bridge, so only 1 strain gauge per HX711 is needed.)
What I thought would be a good way, is to connect the HX711 to the Arduino like normal, but also connect the Arduino and the HX711 to something like a switchboard, in which the Arduino tells it to which setup to connect to, and the switchboard then changes the connections (pretty much like a transitor.)
Not sure if I‘m clear here, so something like this:
(This - means connected to)
- Arduino - HX711
- Arduino - Switch
- HX711 - Switch
- Switchboard - StrainGaugeQB [1,2,3,4...100] (All 100+ quarter bridges = 400 wires.)
Basically, the Arduino switches between which strain gauge is to be read currently. Although they should at the end still each be read at least 4-5 times a second.
I read something about multiplexers, but they don‘t seem to be exactly what I‘m looking for. They seem to be only serial, or did I get that wrong? They only have one in/out connected, but if it‘s not serial, could I maybe use 4 or those each getting one of the wires of the HX711? Something like multiplexer 1 being connected to wire e+ of multiple quarterbridges, 2 being e- of those, 3/4 being connected to their a+/a-?